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author | Li Zefan <lizf@cn.fujitsu.com> | 2011-04-20 10:31:50 +0800 |
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committer | Li Zefan <lizf@cn.fujitsu.com> | 2011-04-25 16:46:09 +0800 |
commit | 33345d01522f8152f99dc84a3e7a1a45707f387f (patch) | |
tree | 6a978702dc4421768e63501fa15bc8fedd5bff32 /fs/btrfs/btrfs_inode.h | |
parent | 0414efae7989a2183fb2cc000ab285c4c2836a00 (diff) | |
download | linux-33345d01522f8152f99dc84a3e7a1a45707f387f.tar.bz2 |
Btrfs: Always use 64bit inode number
There's a potential problem in 32bit system when we exhaust 32bit inode
numbers and start to allocate big inode numbers, because btrfs uses
inode->i_ino in many places.
So here we always use BTRFS_I(inode)->location.objectid, which is an
u64 variable.
There are 2 exceptions that BTRFS_I(inode)->location.objectid !=
inode->i_ino: the btree inode (0 vs 1) and empty subvol dirs (256 vs 2),
and inode->i_ino will be used in those cases.
Another reason to make this change is I'm going to use a special inode
to save free ino cache, and the inode number must be > (u64)-256.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Diffstat (limited to 'fs/btrfs/btrfs_inode.h')
-rw-r--r-- | fs/btrfs/btrfs_inode.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h index 57c3bb2884ce..8842a4195f91 100644 --- a/fs/btrfs/btrfs_inode.h +++ b/fs/btrfs/btrfs_inode.h @@ -166,6 +166,15 @@ static inline struct btrfs_inode *BTRFS_I(struct inode *inode) return container_of(inode, struct btrfs_inode, vfs_inode); } +static inline u64 btrfs_ino(struct inode *inode) +{ + u64 ino = BTRFS_I(inode)->location.objectid; + + if (ino <= BTRFS_FIRST_FREE_OBJECTID) + ino = inode->i_ino; + return ino; +} + static inline void btrfs_i_size_write(struct inode *inode, u64 size) { i_size_write(inode, size); |